A Wisdom Archive on Porous

Asthi Soshirya: Porous or brittle bones; osteoporosis.

 
(See also: Asthi Soshirya, Yoga, Yoga Dictionary )

Alum - Potash alum. Potash alum, K2SO4·Al2(SO4)3·24H2O, crystallizes in regular octahedra and is very soluble in water. The solution reddens litmus and is an astringent. When heated to nearly a red heat it gives a porous, friable mass which is known as "burnt alum." It fuses at 92 °C in its own water of crystallization. "Neutral alum" is obtained by the addition of as much sodium carbonate to a solution of alum as will begin to cause the separat ...

Read more here: » Alum: Encyclopedia II - Alum - Types of alum

Absorption, in chemistry, is a physical or chemical phenomenon or a process in which atoms, molecules, or ions enter some bulk phase - gas, liquid or solid material. This is a different process from adsorption, since the molecules are taken up by the volume, not by surface. A more general term is sorption which covers adsorption, absorption, and ion exchange. If absorption is a physical process not accompanied by any other physical or chemical process, it usually follows the Nernst partition law: "the ratio of concentrations of some solute species in two bulk phases in contact is c ... Including:

• Absorption chemistry - Technical example

Read more here: » Absorption chemistry: Encyclopedia - Absorption chemistry

There were many conditions in both Kenya and Tanzania that made the two countries choice targets for al Qaeda attacks. These include: anarchic rule by corrupt local law enforcement, porous borders with lax security that allowed unregulated movement of people and supplies, active local terrorist organizations other than al Qaeda, political violence endemic to the region, a large contingent of Americans in an embassy vulnerable to attack, and the destabilizing influence of neighboring countries embroiled in wars and conflicts (Somalia, Rwanda ...

Read more here: » 1998 U.S. embassy bombings: Encyclopedia II - 1998 U.S. embassy bombings - Security conditions and warnings

The Kingdom of Bhutan (IPA: /buː'tɑːn/ Listen ▶ (help·info)) is a landlocked South Asian nation situated between India and China.The landscape ranges from the subtropical plains to the Himalayan heights, an elevation gain of more than 7000 m. Its economy is based on subsistence agriculture (emphasizing corn and rice) and animal husbandry. Small, terraced farms predominate. Forestry, hydroelectric ... Including:

• Bhutan - The Name
• Bhutan - History
• Bhutan - Geography
• Bhutan - Economy
• Bhutan - Government and politics
• Bhutan - Districts
• Bhutan - Military and foreign affairs
• Bhutan - Demographics
• Bhutan - Culture
• Bhutan - Current Affairs
• Bhutan - Notes

Read more here: » Bhutan: Encyclopedia - Bhutan

87 Sylvia (sil'-vee-a) is one of the largest main belt asteroids. It orbits beyond most of the main belt asteroids, so it is classed as one of the Cybeles (see Minor planet groups). Sylvia is remarkable for being the first known asteroid to possess more than one moon. 87 Sylvia - Discovery and naming. Sylvia was discovered by N. R. Pogson on May 16, 1866 from Madras (Chennai), India. Paul Herget, in his The Names of the Minor Planets (1955), attributes the name as honouring the first wife of a ... Including:

• 87 Sylvia - Discovery and naming
• 87 Sylvia - Physical characteristics
• 87 Sylvia - Moons

Read more here: » 87 Sylvia: Encyclopedia - 87 Sylvia

Agate is a term applied not to a distinct mineral species, but to an aggregate of various forms of silica, chiefly chalcedony. According to Theophrastus, the agate (achates) was named from the river Achates, now the Drillo, in Sicily, where the stone was first found. Agate - Formation and characteristics. Most agates occur as nodules in eruptive rocks or ancient lavas where they represent cavities originally produced by the disengagement of vapour in the molten mass which were then filled, wholly or ... Including:

• Agate - Formation and characteristics
• Agate - Types of agate
• Agate - Agate beliefs
• Agate - Reference

Read more here: » Agate: Encyclopedia - Agate

• Elite - Religious élite
• Elite - Linguistic élite
• Elite - Class élite
• Elite - Educational élite
• Elite - Financial élite
• Elite - Élitism

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Alum, in chemistry, is a term given to the crystallized double sulfates of the typical formula M+2SO4·M3+2(SO4)3·24H2O, where M+ is the sign of an alkali metal (lithium, sodium, potassium, rubidium, or caesium), and M3+ denotes one of the trivalent metals (typically aluminium, chromium, or iron (III)). The ammonium ion (NH4+) also occurs in the M+ position. These salts are employed in ... Including:

• Alum - Alchemical and later discoveries and uses
• Alum - Pliny's writings
• Alum - Alum from alunite
• Alum - Alum from clays or bauxite
• Alum - Types of alum
• Alum - Soda alum
• Alum - Chrome alum
• Alum - Ammonium alum
• Alum - Alum solubility
• Alum - Uses

Read more here: » Alum: Encyclopedia - Alum

The mission's Principal Investigator is Michael A'hearn, an astronomer at the University of Maryland. The Deep Impact mission will help answer fundamental questions about comets, such as: Is the composition of a cometary nucleus the same throughout, or has some physical process caused the interior to become differentiated from the surface? In other words, is the nucleus layered? Are cometary nuclei highly cohesive and tightly-packed, or porous conglomerates? Do any parts of a cometary nucleus contain pristine material that have been untouched since the creatio ...

Read more here: » Deep Impact space mission: Encyclopedia II - Deep Impact space mission - Scientific goals

In the post-impact briefing at 0100 Pacific Daylight Time on July 4, 2005, the first processed images revealed existing craters on the comet. NASA scientists stated they could not see the new crater that had formed from the impactor. The only models of cometary structure they could positively rule out were the very porous models which had comets as loose aggregates of material. Data from the mission is still being analyzed, but initial results were surprising. The material excavated by the impact contained more dust and less ice than had been expected. In addition, the material was finer than expected; sci ...

Read more here: » Deep Impact space mission: Encyclopedia II - Deep Impact space mission - Results

Moss is considered a weed in grass lawns, but is deliberately encouraged to grow under aesthetic principles exemplified by Japanese gardening. In old temple gardens, moss can carpet a forest scene. Moss is thought to add a sense of calm, age and stillness to a garden scene. Rules of cultivation are not widely established. Moss collections are quite often begun using samples transplanted from the wild in a water-retaining bag. However, specific species of moss can be extremely difficult to maintain away from their natural site (with its unique combination of light ...

Read more here: » Moss: Encyclopedia II - Moss - Cultivation